Flat mount disc caliper on another mount?  There is a converter for that

Flat mount disc caliper on another mount? There is a converter for that

When it comes to bikes, there are an endless number of component incompatibilities. Anyone trying to install a new road-style flat disc brake caliper on an old or less road-focused tire (or fork) with post-install tabs has likely encountered such an issue. In most cases, the simplest answer is to mix mountain bike brake calipers with road levers, but there may be a better option.

Today, bike component maker Wolf Tooth announced an adapter, the sole purpose of which is to allow you to mount a flat mount brake caliper to a fork or other mount frame. And it’s a welcome product given that the latest road and gravel groupsets from Shimano, SRAM and Campagnolo are only available with flat calipers. This black anodized aluminum adapter is designed to be as simple as it sounds, but there are a few conditions.

One adapter is required for each brake.

First, the limited clearance available by mixing these two standards means that the adapter requires you to add 20mm to the size of your rotor. If the mounting brackets on your frame or fork are original to a 140mm rotor, using this adapter will require a 160mm rotor. If your frame/fork is designed to be a direct fit on a 160mm rotor, you will need a 180mm rotor with this adapter. and so on.

Another condition is that you need a clearance of at least 13 mm under the height of the subsequent installation tabs. Some frame and fork designs will easily clear this, while others see the adapter rendered unusable by slipping off the frame.

The adapter sits below the post holder line. This minimum clearance required may present issues with a small number of frame/fork designs.

On paper, the Wolf Tooth design doesn’t seem to add much new to the pre-existing and relatively unknown flat mount adapters from Canadian ASSolutions. And while Wolf Tooth only offers one adapter, the original designer builds on the idea with several specific solutions aimed at keeping your rotor size unchanged (providing tire clearance).

However, what Wolf Tooth brings to the table is a more established distribution network that will hopefully mean that this compatibility issue will frustrate fewer people. The aptly named Wolf Tooth Post to Flat Mount Brake Adapter retails for $30, while ASSolutions has the original concept at CAD40.

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